Operational Overview
Doc.#6000-0015 Rev: A
Page 25
Sensor
I Out
SIO
Pin 4
+5 V
Pin 3
Pin 2
I in
Pin 1
Ground
Figure 19. Current Sensor Connections
RTD (SIO models SC510 – SC511)
These SIO units interface to either 100 Ohm or 1000 Ohm RTD sensors.
Two-, three-, or four-wire configurations are accommodated. The SIOs
supply both excitation and amplification for the RTDs. The SIO
inputs/outputs on the terminal block are shown in Table 5.
Table 5. RTD Sensor Pinout
Pin Signal
1 Ground
(Node
ground)
2 +
Sense
3 -
Sense
4 Excitation
4-Wire RTD configuration:
4-Wire RTD sensor connections, illustrated in Figure 20, are:
a. Pin 1 (Ground) to the RTD.
b. Pin 2 (+ Sense) to the RTD.
c. Pin 3 (- Sense ) to the RTD and SIO pin 1 at the RTD.
d. Pin 4 (Excitation) to the RTD and SIO pin 2 at the RTD.
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IMPORTANT
The RTD must not be connected to any local ground.
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